/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.io.gcp.spanner;



import com.google.cloud.spanner.BatchReadOnlyTransaction;

import com.bff.gaia.unified.sdk.transforms.DoFn;



/** Creates a batch transaction. */

class CreateTransactionFn extends DoFn<Object, Transaction> {



  private final SpannerIO.CreateTransaction config;



  CreateTransactionFn(SpannerIO.CreateTransaction config) {

    this.config = config;

  }



  private transient SpannerAccessor spannerAccessor;



  @DoFn.Setup

  public void setup() throws Exception {

    spannerAccessor = config.getSpannerConfig().connectToSpanner();

  }



  @Teardown

  public void teardown() throws Exception {

    spannerAccessor.close();

  }



  @ProcessElement

  public void processElement(ProcessContext c) throws Exception {

    BatchReadOnlyTransaction tx =

        spannerAccessor.getBatchClient().batchReadOnlyTransaction(config.getTimestampBound());

    c.output(Transaction.create(tx.getBatchTransactionId()));

  }

}